A see Ampere ac

Voltage drop - Voltage or difference in potential developed across a component due to current flow.

Voltage rating - Maximum voltage a component can withstand without breaking down.

Voltage regulator - Device or circuit that maintains constant output voltage (within certain limits) in spite of changing line voltage and/or load current.

Voltage source - Circuit or device that supplies voltage to a load.

Voltaic cell - Primary cell having two unlike electrodes immersed in a solution that chemically interacts to produce a voltage.

Volt-ampere - Unit of apparent power in an AC circuit containing capacitive or inductive reactance. Apparent power is the product of source voltage and current.

Voltmeter - Instrument used to measure difference in potential between two points.

Watt - Unit of electrical power required to do work at the rate of one joule per second. One watt of power is expended when one ampere of direct current flows through a resistance of one ohm. In an AC circuit, true power is the product of effective volts and effective amperes, multiplied by the power factor.

Wavelength - (l) Distance between two points of corresponding phase and is equal to waveform velocity divided by frequency.

Winding - One or more turns of a conductor wound in the form of a coil.

Wire - Single solid or stranded group of conductors having a low resistance to current flow. Used to make connections between circuits or points in a circuit.

Wire gauge - American wire gauge (AWG) is a system of numerical designations of wire diameters.

Wireless - Term describing radio communication that requires no wires between two communicating points.

Wire wound resistor - Resistor in which the resistive element is a length of high resistance wire or ribbon usually nichrome wound onto an insulating form.

Work - Work is done any time energy is transformed from one type to another. The amount of work done is dependent on the amount of energy transformed.

X - Symbol for reactance. See reactance.

Y - Symbol for admittance. See admittance.

Zener Diode - Semiconductor diodes in which reverse breakdown voltage current causes the diode to develop a constant voltage. Used as a clamp for voltage regulation